Dependencies missing versions - causing incompatibilities

[AnnikaLindh]

Thanks for this very useful tool. :)

I have used it in my code but came across a problem now when re-installing it. In setup.py there is a list of requirements, but most of these libraries do not have a version specified. This means that the installation will attempt to get the latest versions of these dependencies which can cause incompatibilities with the Python version or other libraries.

I'm installing via pip install speaksee==0.0.1 which used to work fine for Python 3.5+ but now it requires Python 3.7+ and this might be pushed to even later versions in the future as those libraries update their latest versions.

Would it be possible to add the versions of the dependencies that are appropriate so that we can base our own code on a fixed version? Preferably compatible with older versions of Python if possible. Thanks in advance!